Switching Box

[Dror3332]

Hi all,

I need help with building a 5 channel switching box. no matrix here.
I mean  A or B or C or D or E.
I'm sure that this kind of switching box is what most of us guitar players need 


Thanks in advance for any help that will suggest here.
Dror

[Dror3332]

How can I load a JPG?

[aron]

See about this forum.... for how to upload a pic.

As for a multi-true bypass box, see this forum:

http://www.diystompboxes.com/smfforum/index.php?board=10.0

OTOH, if you truly mean a pedal switcher that only allows one pedal to be active at a time, I can't think of an easy way right now.

[Dror3332]

See about this forum.... for how to upload a pic.

As for a multi-true bypass box, see this forum:

http://www.diystompboxes.com/smfforum/index.php?board=10.0

OTOH, if you truly mean a pedal switcher that only allows one pedal to be active at a time, I can't think of an easy way right now.

I don't think it will be easy 
But it's very needy. I will try to find something similar on this forum, and if you can point to something it will be helpful. Thanks Aron.

Here is something to describe what I'm talking about
http://aronnelson.com/gallery/Schematics-etc/Switch_Box

[aron]

Like a rotary switch.... hmm....

I wonder if a CMOS circuit could be adapted for this?

http://members.shaw.ca/roma/switching-2.html

and

http://www.doctronics.co.uk/4016.htm

[Dror3332]

It's act like a rotary switch but there's a switch for each channel.

[Dror3332]

Like a rotary switch.... hmm....

I wonder if a CMOS circuit could be adapted for this?

http://members.shaw.ca/roma/switching-2.html

and

http://www.doctronics.co.uk/4016.htm

It's looks very interesting, but this kind of switching could effect the sound. Isn't it?

[R.G.]

It's really, really easy in concept, just hard in execution.

Go to Geofex. Find the article on "Programmable Footswitch" system. Go to illustration 7, the one with the 74C373 selector switch. That schemo lets you use a momentary footswitch to select one out of a group of things, and it latches when you press the button, which is what I think you're describing. Then use the latched signal to turn on a relay driver to un-bypass your effects. Each effect gets a DPDT relay (the US$2.50 NEC EA2 works very well). The bits and pieces are all well described at GEO.

It's almost like people ought to read the info at GEO first.

[Gladmarr]

It's almost like people ought to read the info at GEO first.

RG, it seems that could just be your auto answer to everything.  It seems you've covered most questions on GEO.  Maybe your signature line should just say, "have you checked GEO, the answer is probably there."      

It's a good thing the resources are there, I just have to admit, I'm guilty of it too.  I know there are questions I've asked in the past that are there, and I didn't find out until later.

[Dror3332]

Hi R.G.

I saw your project. Did you actually built it? cause I didn't find a project with a good instruction of how to do it.
Most fo them are good ideas and are foggy with parts layout.
I don't realy know how to design circuits, I just have a good hands to build it.
I'll be glad to find a project like in the GGG site.

thanks

[Paul Marossy]

Couldn't you just use an FET mixer similar to this one? http://www.aaroncake.net/circuits/mixer1.htm All you would have to do then is break the signal path from the input to the FET. Of course, this would only work if your effects can handle being in parallel. If that's a problem, then you could add a series/parallel switch to a couple of the inputs, if required.

Just a thought... 

[Dror3332]

Couldn't you just use an FET mixer similar to this one? http://www.aaroncake.net/circuits/mixer1.htm All you would have to do then is break the signal path from the input to the FET. Of course, this would only work if your effects can handle being in parallel. If that's a problem, then you could add a series/parallel switch to a couple of the inputs, if required.

Just a thought... 

Thanks Paul,

I can't see how I can use it. It's a mixer not a switcher 

[Paul Marossy]

I can't see how I can use it. It's a mixer not a switcher.

Hmm... I was thinking that you wanted to be able to combine inputs into one output. After I re-read your original post, I can see that you want only one at a time. ( ) That is a lot trickier. I think it could be done with some sort of looper that used a lot of footswitches. I made a two channel one that way, but 5 channels is another story...

[lovekraft0]

Seems to me that it would be much easier to simply buffer all the inputs from a common bus and only switch the outputs. That should simplify the switching and significantly lower the parts count. It's not "true bypass", but it shouldn't impact the sound if the switching works correctly, right?

[Paul Marossy]

Seems to me that it would be much easier to simply buffer all the inputs from a common bus and only switch the outputs. That should simplify the switching and significantly lower the parts count. It's not "true bypass", but it shouldn't impact the sound if the switching works correctly, right?

That's kind of why I suggested what I suggested...

[Dror3332]

I think R.G. has a few interesting ideas ( that probably he implement them  ) in the geofx site.

The Switching Box should have a group of relays that each relay connect and disconnect one send/return set.
This group of relays should be controled by an electronics logic circuit that commit the following states table.

lets say we have 4 switches

Pressing
  ||                sw1         sw2           sw3          sw4
sw1                 1             0               0               0

sw2                 0             1               0               0

sw3                 0             0               1               0

sw4                 0             0               0               1


I hope it's clear